I know that but when i add an empty signature field and a MDP signature with "allowedchanges" equal to "sacFillInForms", the document restriction "signing" doesn't change (not allowed) and i can't sign the document in acrobat reader (cf. document.jpg).

First, if Adobe Reader is able to sign this empty signature field without a MDP signature?
Could you please attach here or to helpdesk a sample document.
Also, please try to enable both sacFillInForms and sacComment options.

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